CN113069856A - Fan motor control method and control system of bag-type dust removal system - Google Patents
Fan motor control method and control system of bag-type dust removal system Download PDFInfo
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- CN113069856A CN113069856A CN202110355042.7A CN202110355042A CN113069856A CN 113069856 A CN113069856 A CN 113069856A CN 202110355042 A CN202110355042 A CN 202110355042A CN 113069856 A CN113069856 A CN 113069856A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
Abstract
The invention discloses a fan motor control method of a bag-type dust removal system, wherein the bag-type dust removal system comprises a bag-type dust remover, a fan and N dust removal points, wherein N is not less than 1 and is an integer; the fan motor control method comprises the following steps: acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector; if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; wherein, the target dust removing point is a dust removing point of the N dust removing points, and a dust removing point valve is opened; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0Is the maximum total of the fanThe air quantity; controlling the running current of the fan motor to be within a preset current range; the preset current range is [ 80%. times.I ]Rated value,90％×IRated value]，IRated valueIs the rated current value of the fan motor; according to the control method, when the pressure difference exceeds the preset pressure difference, the air quantities of the multiple dust removing points are kept in a reasonable distribution state, the dust removing effect is ensured, and the loss of a fan motor is avoided.
Description
Technical Field
The application relates to the technical field of steel making, in particular to a fan motor control method and a fan motor control system of a bag type dust removal system.
Background
In the field of metallurgy, a bag-type dust removal system is often used for dust removal, for example, a secondary dust removal system for desulfurization in a molten iron pretreatment desulfurization workstation for steel making is the bag-type dust removal system. Generally speaking, a bag-type dust removal system is provided with a bag-type dust remover and a dust removal fan, and more than one dust removal point is arranged at a target device according to the dust removal requirement; for example, four desulfurization stations are provided for molten iron pretreatment and desulfurization in a certain steel plant, each desulfurization station can be provided with a dust removal point control dust removal point air door and air volume, and the four dust removal point air doors and the flow are controlled by a bag-type dust remover and a dust removal fan in a unified manner, and the dust removal fan is controlled by a fan motor; the air doors are opened when the four desulfurization stations carry out pretreatment desulfurization and slagging-off on molten iron, and the air doors are closed when the molten iron is not in the desulfurization stations. However, in actual operation, due to untimely replacement of the cloth bag dust remover or some other reasons, the pressure difference between the inlet and the outlet of the cloth bag dust remover is easy to generate, on one hand, the dust removal air quantity is easy to break away from reasonable distribution, and on the other hand, the fan motor equipment is easy to damage.
Disclosure of Invention
The invention provides a fan motor control method and a fan motor control system of a bag-type dust removal system, which aim to solve or partially solve the technical problems that the dust removal air volume is unbalanced and a fan motor is easy to damage due to the fact that the pressure difference of an inlet and an outlet of a bag-type dust remover is out of balance.
In order to solve the technical problem, the invention provides a fan motor control method of a bag-type dust removal system, wherein the bag-type dust removal system comprises a bag-type dust remover, a fan and N dust removal points, and N is an integer and is more than or equal to 1; the fan motor control method comprises the following steps:
acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector;
if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; wherein the target dust removing point is a dust removing point of the N dust removing points, the dust removing point valve of which is opened; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained;
controlling the running current of the fan motor to be within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor.
Optionally, the fan motor control method further includes:
acquiring an air quantity detection value of the target dust removing point and an operating current detection value of the fan motor;
the method for controlling the air volume of the target dust removing point to be within the preset air volume range specifically comprises the following steps:
judging whether the air volume detection value is within the preset air volume range or not; if the air volume detection value is not in the preset air volume range, adjusting the opening degree of a dedusting point valve of the target desulfurization station to control the dedusting point air volume of the target desulfurization station to reach the target air volume; the target air volume is a median air volume within the preset air volume range;
control fan motor's operating current is in the default current range, specifically includes:
if the air volume detection value is within the preset air volume range, judging whether the operation current detection value is within the preset current range; if the operating current detection value is not in the preset current range, adjusting a fan valve to control the operating current of the fan motor to a target current value, wherein the target current value is 0.85 xIRated value。
Further, the fan motor control method further comprises the following steps:
in the process of adjusting the opening degree of the dedusting point valve of the target desulfurization station, if the operating current detection value exceeds the rated current value I of the fan motorRated valueStopping adjusting the opening of the dedusting point valve, and starting adjusting a fan valve to control the running current of the fan motor to reach the target current value;
and when the running current of the fan motor reaches the target current value, adjusting the opening of the dedusting point valve of the target desulfurization station again to enable the dedusting point air volume of the target desulfurization station to reach the target air volume.
Further, the fan motor control method further comprises the following steps:
if the pressure difference does not exceed the preset pressure difference, controlling the air quantity of the dust removal point of the target desulfurization station to reach the target air quantity, wherein the running current of the fan motor is within a preset current range; wherein the target air volume is a median air volume within the preset air volume range.
According to the technical scheme, the desulfurization secondary dust removal system is applied to steel making, and the preset pressure difference is 1000 Pa.
According to the technical scheme, the preset air volume range is 210000m3H to 250000m3/h。
Based on the same inventive concept of the technical scheme, the invention also provides a fan motor control system of the bag-type dust removal system, wherein the bag-type dust removal system comprises a bag-type dust remover, a fan and N dust removal points, and N is an integer which is not less than 1; the fan motor control system includes:
the acquisition module is used for acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector;
the control module is used for controlling the air volume of the target dust removing point to be within a preset air volume range if the pressure difference exceeds a preset pressure difference; wherein the target dust removing point is a dust removing point of the N dust removing points, the dust removing point valve of which is opened; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained; controlling the running current of the fan motor to be within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor.
Optionally, the obtaining module is further configured to obtain an air volume detection value of the target dust removal point and an operating current detection value of the fan motor;
the control module is specifically configured to: judging whether the air volume detection value is within the preset air volume range or not; if the air volume detection value is not in the preset air volume range, adjusting the opening degree of a dedusting point valve of the target desulfurization station to control the dedusting point air volume of the target desulfurization station to reach the target air volume; the target air volume is a median air volume within the preset air volume range;
if the air volume detection value is in the preset air volume rangeJudging whether the operating current detection value is within the preset current range or not; if the operating current detection value is not in the preset current range, adjusting a fan valve to control the operating current of the fan motor to a target current value, wherein the target current value is 0.85 xIRated value。
Further, the control module is further configured to:
in the process of adjusting the opening degree of the dedusting point valve of the target desulfurization station, if the operating current detection value exceeds the rated current value I of the fan motorRated valueStopping adjusting the opening of the dedusting point valve, and starting adjusting a fan valve to control the running current of the fan motor to reach the target current value;
and when the running current of the fan motor reaches the target current value, adjusting the opening of the dedusting point valve of the target desulfurization station again to enable the dedusting point air volume of the target desulfurization station to reach the target air volume.
Further, the control module is further configured to: if the pressure difference does not exceed the preset pressure difference, controlling the air quantity of the dust removal point of the target desulfurization station to reach the target air quantity, wherein the running current of the fan motor is within a preset current range; wherein the target air volume is a median air volume within the preset air volume range.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a fan motor control method of a bag-type dust removal system, which comprises the following steps: acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector; if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained; the air volume of the target dust removing point is controlled within the preset air volume range, so that the air volume of more than one dust removing point is centralized and reasonably distributed, and the dust removing effect is ensured; then controlling the operation current of the fan motorMaking the current in a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor; the operation current of the fan motor is controlled within the preset current range, so that the fan motor can reach the optimal working state; in general, when the pressure difference of the inlet and the outlet of the bag-type dust remover exceeds the preset pressure difference, the method can keep the air quantity of a plurality of dust removing points in a reasonable distribution state through the air quantity control of the target dust removing point and the operation current control of the fan motor, ensure the dust removing effect and avoid the motor loss and energy waste caused by the operation of the fan exceeding the rated current.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 illustrates a flow chart of a fan motor control method for a bag house system according to one embodiment of the present invention;
FIG. 2 illustrates a logic control diagram of a fan motor control method according to one embodiment of the present invention;
FIG. 3 shows a simplified schematic diagram of a device connection of a dusting system according to an embodiment of the invention;
FIG. 4 is a logic control diagram illustrating a fan motor control method applied to a bag house system for pre-treatment desulfurization of molten iron according to another embodiment of the present invention;
FIG. 5 shows a schematic of a fan motor control system for a bag house system according to one embodiment of the invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
The inventor researches and discovers that if the pressure difference between an inlet and an outlet of the bag-type dust remover is too large, the air door of a fan body and the opening degree of the air door of a dust removing point of a desulfurization station are easily too large, so that the air quantity of the dust removing point is separated from reasonable distribution; and the too big operating current that makes fan motor easily exceeds rated value operation, and long-time accumulation causes fan motor equipment to damage.
Based on the above research results, in an alternative embodiment, as shown in fig. 1, a method for controlling a fan motor of a bag-type dust removal system is provided, which has the following overall concept:
the bag-type dust removal system comprises a bag-type dust remover, a fan and N dust removal points, wherein N is not less than 1 and is an integer; the fan motor control method comprises the following steps:
s1: acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector;
s2: if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; wherein the target dust removing point is a dust removing point of the N dust removing points, the dust removing point valve of which is opened; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained;
s3: controlling the running current of the fan motor to be within a preset current range; the preset currentThe range is [ 80%. times.I ]Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor.
In general, when the pressure difference of an inlet and an outlet of the bag-type dust remover exceeds a preset pressure difference, the air quantity of a target dust removing point with the dust removing point valve opened is controlled within a preset air quantity range, so that the air quantity of each dust removing point is kept in optimal distribution; and then the running current of the fan motor is controlled within the range of 80-90% of the rated current, so that the fan motor runs within the optimal current range, and the motor fault caused by the fan running current exceeding the rated current is avoided.
In the scheme, the preset pressure difference is actually determined according to the specification and the specific application scene of the bag-type dust collector, and may be, for example, 500Pa, 1000Pa, 2000Pa, 4000Pa, and the like.
The preset air volume range is determined according to the total air volume of the dust removal fan and the number of the dust removal point valves, the bag-type dust remover can be provided with N dust removal points at different positions, when the air door is fully opened, the maximum air volume of each dust removal point is the average air volume obtained by dividing the total air volume of the dust removal fan by N, and the optimal air volume of each dust removal point can be measured according to actual requirements and the percentage of the maximum air volume.
The preset current range is an optimal operation current interval determined according to the actual operation condition of a fan motor of the bag-type dust collector.
In the following embodiments, the above-described scheme will be explained in detail:
in order to adjust the air quantity of the dust removing point and the operation current of the fan motor, the operation parameters need to be obtained firstly, so the fan motor control method further comprises the following steps:
s11: acquiring an air quantity detection value of the target dust removing point and an operating current detection value of the fan motor;
specifically, the air quantity detection of the target dust removing point can be realized through flow detection equipment, and the running current of a fan motor can be detected through a current transformer;
based on the air volume detection value, for step S2, one scheme for controlling the air volume of the target dust removing point to be within the preset air volume range may be:
s21: judging whether the air volume detection value is within the preset air volume range or not; if the air volume detection value is not in the preset air volume range, adjusting the opening degree of a dedusting point valve of the target desulfurization station to control the dedusting point air volume of the target desulfurization station to reach the target air volume; the target air volume is a median air volume within the preset air volume range;
the median air volume refers to a median air volume obtained by averaging an upper limit value and a lower limit value in a preset air volume range, for example, the preset air volume range applied to a certain scene is [ 80% × Q ]1,90％×Q1]If the median air volume is 85% multiplied by Q1。
The step of S21 may further include:
s211: in the process of adjusting the opening degree of the dedusting point valve of the target desulfurization station, if the operating current detection value exceeds the rated current value I of the fan motorRated valueStopping adjusting the opening of the dedusting point valve, and starting adjusting a fan valve to control the running current of the fan motor to reach the target current value;
s212: and when the running current of the fan motor reaches the target current value, adjusting the opening of the dedusting point valve of the target desulfurization station again to enable the dedusting point air volume of the target desulfurization station to reach the target air volume.
Meanwhile, for step S3, one scheme for controlling the operating current of the fan motor to be within the preset current range may be:
s31: if the air volume detection value is within the preset air volume range, judging whether the operation current detection value is within the preset current range; if the operating current detection value is not in the preset current range, adjusting a fan valve to control the operating current of the fan motor to a target current value, wherein the target current value is 0.85 xIRated value。
The above scheme is realized by programming in the controller, and is described in detail with reference to the accompanying figure 2:
(1) firstly, detecting whether the pressure difference of an inlet and an outlet of a bag-type dust collector exceeds a preset pressure difference, and if not, indicating that the conventional bag-type dust collection system is normal;
(2) when the pressure difference of the inlet and the outlet of the bag-type dust remover exceeds a preset pressure difference, firstly judging whether a dust removing point valve is opened, and if at least one dust removing point valve is opened, starting to judge the air quantity of a dust removing point; if all the valves of the dust removal points are closed, program judgment is not carried out;
(3) if the valve of the dust removal point is detected to be opened, real-time detection is started, and whether the air volume of the dust removal point of each dust removal point is within a preset air volume range or not is judged, and at the moment, two conditions are divided:
(3-1) if the air volume of a certain dust removing point is out of the preset air volume range, if the air volume of the certain dust removing point exceeds the upper limit of the preset air volume or is lower than the lower limit of the preset air volume, starting to adjust a corresponding dust removing point valve so as to enable the air volume of the dust removing point to return to the preset range; when the dust removing point valve is adjusted, judging whether the running current of the fan motor exceeds the rated current or not, if not, continuously adjusting the dust removing point valve, and adjusting the current dust removing point air volume to the target air volume, namely the median air volume, so as to ensure that the dust removing point air volume returns to the preset range;
if the running current of the fan motor exceeds the rated current in the process of adjusting the dust removing point valve, the adjustment of the dust removing point valve is suspended, and the fan valve, namely the total flow of the dust removing fan, is adjusted firstly, so that the running current of the fan motor is adjusted back to the 85% rated current value; then returning to the valve for adjusting the dust removal point;
(3-2) if the air volume of a certain dust removing point is within a preset air volume range, next, judging whether the running current value of the fan motor is within a preset current range, and at the moment, dividing into two conditions:
(4-1) if the operating current value of the fan motor is within the preset current range, indicating that the cloth bag dust removal system is normally and reasonably operated;
and (4-2) if the running current value of the fan motor is not within the preset current range, adjusting a fan valve, and adjusting the actual running current of the fan motor to 85% of the rated current value.
The general principle in the above scheme is: in the dust removal process, firstly, the running current of the fan motor is ensured not to exceed the rated current of the motor, then, the air volume of the dust removal point of each opened dust removal point is controlled within a preset air volume range, and then, the running current of the fan motor is ensured within the range of 80-90% of the rated current, so that the fan motor is in the best working state on the basis of ensuring the reasonable distribution of the air volume of the dust removal points, namely ensuring the dust removal effect, and the service life of the fan motor is prolonged.
In the working process of the bag-type dust removal system, it is also possible that the pressure difference between the inlet and the outlet of the bag-type dust removal system is normal, but the air volume of the desulfurization dust removal point is not optimized to the maximum, so that the dust removal effect is poor, and based on this, the fan motor control method provided by the embodiment can further include:
if the pressure difference does not exceed the preset pressure difference, controlling the air quantity of the dust removal point of the target desulfurization station to reach the target air quantity, wherein the running current of the fan motor is within a preset current range; wherein the target air volume is a median air volume within the preset air volume range.
When the pressure difference between the inlet and the outlet does not exceed the preset pressure difference, the air quantity of a dust removal point is controlled to be the target air quantity, the operating current of the fan motor is controlled to be within the preset current range, the fan motor can be in the best working state, energy waste or fan equipment loss caused by too low or too high operating current of the fan motor is avoided, meanwhile, the air quantity is reasonably distributed, and the dust removal effect is guaranteed.
In summary, the present embodiment provides a method for controlling a fan motor of a bag-type dust removal system, including: acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector; if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained; the reason for controlling the air volume of the target dust removing point within the preset air volume range is to make the air volume of the target dust removing point within the preset air volume rangeThe air quantity of more than one dust removing point is centralized and reasonably distributed, so that the dust removing effect is ensured; controlling the running current of the fan motor within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor; the operation current of the fan motor is controlled within the preset current range, so that the fan motor can reach the optimal working state; in general, when the pressure difference of the inlet and the outlet of the bag-type dust remover exceeds the preset pressure difference, the method can keep the air quantity of a plurality of dust removing points in a reasonable distribution state through the air quantity control of the target dust removing point and the operation current control of the fan motor, ensure the dust removing effect and avoid the motor loss and energy waste caused by the operation of the fan exceeding the rated current.
Based on the same inventive concept of the previous embodiment, in a further alternative embodiment, the above solution is described in detail in connection with the application of a bag-type dust removal system in a molten iron pretreatment desulfurization workstation for steel making.
The molten iron pretreatment desulfurization of a certain steel mill is provided with four desulfurization stations in total, each desulfurization station can be provided with two dust removal points, and the dust removal point air door and the air volume are controlled according to one dust removal point, namely four dust removal point air doors and the flow. Therefore, the cloth bag dust removal system arranged at the molten iron pretreatment desulfurization workstation comprises: the device comprises a PLC, four sets of desulfurization station dust removal point valves, four sets of desulfurization station dust removal point flow detection equipment, a fan valve, a fan motor current transformer and a dust remover inlet and outlet pressure detection mechanism.
PLC: and receiving the flow detected by the four sets of desulfurization station dedusting points, the inlet and outlet pressure of the dust remover and the current of the fan motor, controlling the four sets of desulfurization dedusting point valves and the fan valve, and performing logic analysis operation.
Four sets of desulfurization station dust removal point valves: and controlling the opening of the dedusting point air valve and receiving a control signal of the PLC.
Four sets of desulfurization station dust removal point flow detection equipment: and detecting the flow of the dedusting point and transmitting the flow to the PLC.
A fan valve: and controlling the opening of the air door of the fan and receiving a control signal of the PLC.
Fan motor current transformer: and detecting the current of the fan motor and transmitting the current to the PLC.
Dust remover import and export pressure detection mechanism: and detecting the pressure of the inlet and the outlet of the dust remover and transmitting the pressure to the PLC.
For a molten iron pretreatment desulphurization workstation in a steelmaking process section, optionally, the preset pressure difference is determined to be 1000 Pa; the maximum total air volume of the fan is 120 ten thousand meters3About/h, corresponding to 4 dust removing points, and determining the preset air volume range of each dust removing point to be 21 ten thousand meters3H to 25 km3H, and a target air volume of 23 km3H; the target current value of the fan motor is 85% of the rated current value.
When the differential pressure of the dust remover does not exceed 1000Pa, in order to avoid the problem that the efficiency is too low due to the fact that the current of a fan motor exceeds a rated value or the running current is too low, the design control method comprises the following steps: when the air volume of each desulfurization station at a dust removal point reaches 23 ten thousand m3/h, the dust removal effect meets the requirement, the excessive air volume can cause waste, the efficiency is not too low when the current of a fan motor runs at 80-90% of the rated current, an extra small normally-open valve is reserved to be used as the safety protection of the complete closing of four dust removal points, and the vacuumizing is avoided. When the fan valve is fully opened and the pressure difference of the dust remover does not exceed 1000Pa, the current of the fan motor is controlled to be about 85% of the rated current of the motor.
In actual operation, the condition that the pressure difference between an inlet and an outlet of a dust remover exceeds 1000Pa exists, the air volume of dust removing points of four desulfurization stations is detected in real time, when the desulfurization station with the opened dust removing point valve is detected, the opening of the opened dust removing point valve is adjusted, and the air volume reaches 23 ten thousand meters3Stopping at the time of/h, so that the instrument ensures that the air quantity is within a preset air quantity range: 21 ten thousand meters3H to 25 km3Within/h, the current change condition of the fan motor needs to be detected in the adjusting process, and the rated current of the motor is not allowed to exceed; if the motor running current exceeds the motor rated current in the adjusting process, the fan valve is adjusted to adjust the motor rated current to 85 percent, the air volume is adjusted again, and if the motor running current is in the range of 80 percent of the rated current to 90 percent of the rated current in the adjusting process, the fan valve does not need to be adjusted to be openedAnd (4) degree.
If the motor current is not in the required range when the air quantity adjustment is finished, controlling the opening degree of a fan valve, and stopping adjusting the fan valve when the motor running current is equal to 85% of the rated current of the motor so as to ensure that the motor current is in the range of 80% to 90% of the rated current of the motor. And then repeatedly detecting whether the air volume meets the requirement.
The general principle is as follows: in the dust removal process, firstly, the running current of the motor is ensured not to exceed the rated current of the motor, and secondly, the air quantity of a dust removal point is ensured to be 21 ten thousand meters3H to 25 km3The/h range, then ensuring that the motor current is in the range of 80% to 90% of the rated current.
The schematic connection diagram of the system device in the above scheme is shown in fig. 3, the logic control diagram is shown in fig. 4, and the specific implementation steps are as follows:
step S1: the method comprises the following steps of building a system, and connecting a PLC (programmable logic controller), four sets of desulfurization station dust removal point valves, four sets of desulfurization station dust removal point flow detection equipment, a fan valve, a fan motor current transformer and a dust remover inlet and outlet pressure detector;
step S2: programming a program in a PLC (programmable logic controller), detecting the air volume of dust removing points of four desulfurization stations in real time under the condition that the pressure difference of a dust remover exceeds 1000Pa in actual operation;
step S3: programming in a PLC (programmable logic controller), and adjusting the opening of each opened dust removal point valve when detecting that the four desulfurization stations have the dust removal point valves opened, wherein the air quantity reaches 23 km3Stopping at the time of/h;
step S4: programming a program in a PLC (programmable logic controller), detecting the current change condition of a motor in the adjusting process, not allowing the current to exceed the rated current of the motor, if the current exceeds the rated current of the motor, firstly adjusting a valve of a fan to adjust the rated current of the motor to 85 percent, and then adjusting the air volume again;
step S5: programming a program in the PLC, and if the current of the motor is within the range from 80% of rated current to 90% of rated current at the moment, not adjusting the opening of a fan valve;
step S6: in the PLC controller, if the motor current is not in the required range when the air volume adjustment is finished, the opening degree of a fan valve is controlled, and when the motor running current is equal to 85% of the rated current of the motor, the fan valve stops adjusting so as to ensure that the motor current is in the range of 80% to 90% of the rated current of the motor. And then repeatedly detecting whether the air volume meets the requirement.
Through using above-mentioned scheme in the desulfurized sack dust pelletizing system of molten iron preliminary treatment, realized the automatic optimization amount of wind and guaranteed dust removal effect, automatically regulated fan motor electric current guarantees equipment steady operation, reduces the environmental protection problem that artifical maloperation caused, has promoted fan motor's utilization ratio, prolongs fan motor's life.
Based on the same inventive concept of the foregoing embodiment, as shown in fig. 5, the present invention further provides a fan motor control system of a bag-type dust removal system, where the bag-type dust removal system includes a bag-type dust remover, a fan, and N dust removal points, where N is an integer greater than or equal to 1; the fan motor control system includes:
the acquisition module 10 is used for acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector;
the control module 20 is configured to control the air volume of the target dust removal point to be within a preset air volume range if the pressure difference exceeds a preset pressure difference; wherein the target dust removing point is a dust removing point of the N dust removing points, the dust removing point valve of which is opened; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained; controlling the running current of the fan motor to be within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor.
Optionally, the obtaining module 10 is further configured to obtain an air volume detection value of the target dust removing point and an operating current detection value of the fan motor;
the control module 20 is specifically configured to: judging whether the air volume detection value is within the preset air volume range or not; if the air volume detection value is not in the preset air volume range, adjusting the opening degree of a dedusting point valve of the target desulfurization station to control the dedusting point air volume of the target desulfurization station to reach the target air volume; the target air volume is a median air volume within the preset air volume range;
if the air volume detection value is within the preset air volume range, judging whether the operation current detection value is within the preset current range; if the operating current detection value is not in the preset current range, adjusting a fan valve to control the operating current of the fan motor to a target current value, wherein the target current value is 0.85 xIRated value。
Further, the control module 20 is further configured to:
in the process of adjusting the opening degree of the dedusting point valve of the target desulfurization station, if the operating current detection value exceeds the rated current value I of the fan motorRated valueStopping adjusting the opening of the dedusting point valve, and starting adjusting a fan valve to control the running current of the fan motor to reach the target current value;
and when the running current of the fan motor reaches the target current value, adjusting the opening of the dedusting point valve of the target desulfurization station again to enable the dedusting point air volume of the target desulfurization station to reach the target air volume.
Further, the control module 20 is further configured to: if the pressure difference does not exceed the preset pressure difference, controlling the air quantity of the dust removal point of the target desulfurization station to reach the target air quantity, wherein the running current of the fan motor is within a preset current range; wherein the target air volume is a median air volume within the preset air volume range.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a fan motor control method of a bag-type dust removal system, which comprises the following steps: acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector; if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0Is the most important of the fanLarge total air volume; the air volume of the target dust removing point is controlled within the preset air volume range, so that the air volume of more than one dust removing point is centralized and reasonably distributed, and the dust removing effect is ensured; controlling the running current of the fan motor within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor; the operation current of the fan motor is controlled within the preset current range, so that the fan motor can reach the optimal working state; in general, when the pressure difference of the inlet and the outlet of the bag-type dust remover exceeds the preset pressure difference, the method can keep the air quantity of a plurality of dust removing points in a reasonable distribution state through the air quantity control of the target dust removing point and the operation current control of the fan motor, ensure the dust removing effect and avoid the motor loss and energy waste caused by the operation of the fan exceeding the rated current.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A fan motor control method of a bag-type dust removal system is characterized in that the bag-type dust removal system comprises a bag-type dust remover, a fan and N dust removal points, wherein N is more than or equal to 1 and is an integer; the fan motor control method comprises the following steps:
acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector;
if the differential pressure exceeds the preset differential pressure, controlling the air volume of the target dust removing point to be within the preset air volume range; wherein the targetThe dust removing point is a dust removing point of the N dust removing points, wherein a dust removing point valve is opened; the preset air volume range is [ 75% x Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained;
controlling the running current of the fan motor to be within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor.
2. The fan motor control method of claim 1, further comprising:
acquiring an air quantity detection value of the target dust removing point and an operating current detection value of the fan motor;
the method for controlling the air volume of the target dust removing point to be within the preset air volume range specifically comprises the following steps:
judging whether the air volume detection value is within the preset air volume range or not; if the air volume detection value is not in the preset air volume range, adjusting the opening degree of a dedusting point valve of the target desulfurization station to control the dedusting point air volume of the target desulfurization station to reach the target air volume; the target air volume is a median air volume within the preset air volume range;
control fan motor's operating current is in the default current range, specifically includes:
if the air volume detection value is within the preset air volume range, judging whether the operation current detection value is within the preset current range; if the operating current detection value is not in the preset current range, adjusting a fan valve to control the operating current of the fan motor to a target current value, wherein the target current value is 0.85 xIRated value。
3. The fan motor control method of claim 2, further comprising:
in the process of adjusting the opening degree of the dedusting point valve of the target desulfurization station, if the operation is carried outThe current detection value exceeds the rated current value I of the fan motorRated valueStopping adjusting the opening of the dedusting point valve, and starting adjusting a fan valve to control the running current of the fan motor to reach the target current value;
and when the running current of the fan motor reaches the target current value, adjusting the opening of the dedusting point valve of the target desulfurization station again to enable the dedusting point air volume of the target desulfurization station to reach the target air volume.
4. The fan motor control method of claim 2, further comprising:
if the pressure difference does not exceed the preset pressure difference, controlling the air quantity of the dust removal point of the target desulfurization station to reach the target air quantity, wherein the running current of the fan motor is within a preset current range; wherein the target air volume is a median air volume within the preset air volume range.
5. The fan motor control method of claim 1, wherein the desulfurization secondary dedusting system is applied to steel making, and the preset pressure difference is 1000 Pa.
6. The fan motor control method of claim 5, wherein the preset air volume range is 210000m3H to 250000m3/h。
7. A fan motor control system of a bag-type dust removal system is characterized in that the bag-type dust removal system comprises a bag-type dust remover, a fan and N dust removal points, wherein N is more than or equal to 1 and is an integer; the fan motor control system includes:
the acquisition module is used for acquiring the pressure difference of an inlet and an outlet of the bag-type dust collector;
the control module is used for controlling the air volume of the target dust removing point to be within a preset air volume range if the pressure difference exceeds a preset pressure difference; wherein the target dust removing point is a dust removing point of the N dust removing points, the dust removing point valve of which is opened; the preset air volume rangeThe circumference is [ 75%. times.Q ]1,95％×Q1]，Q1＝Q0/N；Q0The maximum total air volume of the fan is obtained; controlling the running current of the fan motor to be within a preset current range; the preset current range is [ 80% × I%Rated value,90％×IRated value]Said I isRated valueIs the rated current value of the fan motor.
8. The fan motor control system of claim 7, wherein the obtaining module is further configured to obtain a detected air volume value of the target dust removal point and a detected operating current value of the fan motor;
the control module is specifically configured to: judging whether the air volume detection value is within the preset air volume range or not; if the air volume detection value is not in the preset air volume range, adjusting the opening degree of a dedusting point valve of the target desulfurization station to control the dedusting point air volume of the target desulfurization station to reach the target air volume; the target air volume is a median air volume within the preset air volume range;
if the air volume detection value is within the preset air volume range, judging whether the operation current detection value is within the preset current range; if the operating current detection value is not in the preset current range, adjusting a fan valve to control the operating current of the fan motor to a target current value, wherein the target current value is 0.85 xIRated value。
9. The fan motor control system of claim 8, wherein the control module is further configured to:
in the process of adjusting the opening degree of the dedusting point valve of the target desulfurization station, if the operating current detection value exceeds the rated current value I of the fan motorRated valueStopping adjusting the opening of the dedusting point valve, and starting adjusting a fan valve to control the running current of the fan motor to reach the target current value;
and when the running current of the fan motor reaches the target current value, adjusting the opening of the dedusting point valve of the target desulfurization station again to enable the dedusting point air volume of the target desulfurization station to reach the target air volume.
10. The fan motor control system of claim 8, wherein the control module is further configured to: if the pressure difference does not exceed the preset pressure difference, controlling the air quantity of the dust removal point of the target desulfurization station to reach the target air quantity, wherein the running current of the fan motor is within a preset current range; wherein the target air volume is a median air volume within the preset air volume range.
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